continuous flow. continuous darkening

[canaanmaple]

first time with continuous flow pan. (2x4 drop flue hybrid) I notice the syrup getting darker and richer with every draw. I also notice an increase in dark niter particles in the pan and prefilters. Been boilin about 6-8 hrs a day for a week or so. Does anyone drain the pan at any point to start fresh? The first few draws were nice real light amber color, and also if I make a small batch on a flat pan, it will be much lighter this time of year. The last few draws are dark amber, yet I get nice clarity with a few prefilters and orlon filter.
Is it possible to have too much niter in the pan? or should I relax and have another beer?
thanks!

[Sugarmaker]

Couple questions?
With a continuious flow rig you should produce the lightest syrup Ma Nature gives you. That doesnt mean it may not darken as the sap season and bacteria change in your process. Have seen all that.
Now if your boiling 6-8 hours per day. May I ask how much syrup your producing each day?
I boiled 6 hours last night and made 13 gallons of Amber syrup as an example, Yep I was using a continious flow system. Last syrup look same as the first.
Regards,
Chris

[DrTimPerkins]

If you have any appreciable niter build-up you need to either: a) reverse the flow if your rig allows it or b) clean the pans. Allowing niter to accumulate will definitely result in darker syrup, and risks imparting a burnt-niter off-flavor and burning/warping of pan (even with liquid still in the pan).

[canaanmaple]

Couple questions?
With a continuious flow rig you should produce the lightest syrup Ma Nature gives you. That doesnt mean it may not darken as the sap season and bacteria change in your process. Have seen all that.
Now if your boiling 6-8 hours per day. May I ask how much syrup your producing each day?
I boiled 6 hours last night and made 13 gallons of Amber syrup as an example, Yep I was using a continious flow system. Last syrup look same as the first.
Regards,
Chris

The amount per day has been increasing. the last few days I've gotten about 2 gallons per day. Its only a 2x4, and the arch is not that great design. (gbm) and the fire is hard to keep consistent. I think im only getting about 12 gph average.

[canaanmaple]

If you have any appreciable niter build-up you need to either: a) reverse the flow if your rig allows it or b) clean the pans. Allowing niter to accumulate will definitely result in darker syrup, and risks imparting a burnt-niter off-flavor and burning/warping of pan (even with liquid still in the pan).

thanks Tim! That was my gut feeling.

[DrTimPerkins]

thanks Tim! That was my gut feeling.

You're welcome. I've seen some really ugly, warped beyond fixing pans caused by excessive niter build-up. Scrap metal at that point. Keep them clean and you'll be much happier.

[canaanmaple]

Do you think it is a bad idea to fire the 2x4 hybrid evaporator for only 4 hours or so each night? (day job) I am wondering if it is causing too much mixing of the syrup dividers into the flue dividers when doing so. I know on bigger rigs with separate pans, people say they can close the valve off between the flue pan and syrup pan when shutting down. I don't have that luxury, but I could always use a flat piece of stainless or something to close off the hole between the flue pan and front pans if that would make a significant difference? thanks!

[Ed R]

I have a leader 2x4 Vermonter all in one pan hooked to a 2x2 flat pan that I use as a preheater pan which I can valve off. I have plugs for between the syrup portion panels and between the front pan and flue portion. The biggy is to remember to unplug when you start up the next boil. Boil every night you need to, its better than letting the sap stack up. I would use a flat piece of stainless an a clamp or two.

[eustis22]

>Is it possible to have too much niter in the pan? or should I relax and have another beer?

These are not mutually exclusive.

[maple flats]

Slide a nylon spatula at 45 degrees pointing away from you and pull it towards you on the bottom of the pan, if you feel a drag, clean the pan. If the spatula slides on a smooth bottom, you don't need to clean it yet.